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The correct and timely maintenance of NTN bearings is an important aspect to ensure the normal operation of highway machinery. If the outer spherical bearing is well maintained, it can work for thousands of years or even longer;
On the contrary, the service life of the outer spherical bearing will be greatly reduced, and even serious accidents such as Bush burning and shaft holding will occur. Generally, the operating temperature of lubricating oil of NTN bearing shall not be higher than 50 ℃ In order to ensure sufficient and reliable lubrication of lubricating oil,
the oil level shall be checked timely or regularly to keep the oil level within the specified range. Keep Ntn Outer Spherical Bearing some clean and replace them in time according to the quality requirements of oil products. The failure of external spherical bearing shall be analyzed in detail and eliminated in time.
Common faults and treatment methods of outer spherical bearing are as follows.
In order to give full play to NTN bearing and maintain its due Ntn Outer Spherical Bearing performance for a long time, regular maintenance (regular inspection) must be carried out.
Through proper regular inspection, it is very important to find faults early and prevent accidents before they Ntn Outer Spherical Bearing happen, which is very important to improve productivity and economy.
When removing the NTN bearing for inspection, first make appearance records by photography and other methods. In addition, confirm the Ntn Outer Spherical Bearing amount of remaining lubricant and sample the lubricant before cleaning the bearing.
a. The cleaning of bearings is divided into rough cleaning and fine cleaning, and a metal grid can be placed at the bottom of the container.
b. During rough cleaning, use a Ntn Outer Spherical Bearing brush to remove grease or adhesion in the oil. At this time, if the outer spherical bearing is rotated in oil, pay attention to the damage to the rolling surface due to foreign matters.
c. During fine cleaning, rotate the NTN bearing slowly in oil and carry out it carefully.
The commonly used cleaning agent is neutral water-free diesel oil or kerosene, and sometimes warm lye is used as needed. No matter what kind of cleaning agent you use, Ntn Outer Spherical Bearing always filter it and keep it clean.
After cleaning, immediately coat the outer spherical bearing with antirust oil or antirust grease.
The contact fatigue failure of Timken bearing is the failure caused by the alternating stress on the working surface of the bearing, and the deep spalling is the internal Ntn Outer Spherical Bearing cause of contact fatigue failure.
We know that contact fatigue spalling occurs on the working surface of deep groove ball bearing, which is often accompanied by fatigue cracks. It first occurs from the large alternating shear stress below the contact surface, and then extends to the surface to form different spalling shapes,
such as pitting or pitting spalling, which is called shallow spalling. Due to the gradual expansion of the spalling surface, it often expands to the deep layer, forming deep spalling.
Wear failure refers to the failure caused by the continuous wear of the metal on the working surface Ntn Outer Spherical Bearing caused by the relative sliding friction between the surfaces.
Continuous wear will cause gradual damage to bearing parts, and eventually lead to the loss of bearing dimensional accuracy and other related problems. Wear may affect the change of shape, the increase of fit clearance and the change of working surface morphology,
may affect the lubricant or make it polluted to a certain extent, Ntn Outer Spherical Bearing resulting in the complete loss of lubrication function, so that the bearing loses the rotation accuracy and even cannot operate normally.
Wear failure is one of the common failure modes of various bearings. According to the wear form, it can be divided into common abrasive wear and adhesive wear.
The main reasons for the fracture failure of Timken bearing are the defects of Timken bearing itself and overload during use
When the external load exceeds the material strength limit and causes the part to break, it is called overload fracture. The main cause of overload is the sudden failure or improper installation of the host.
Defects such as microcracks, shrinkage cavities, bubbles, large foreign objects, overheated tissue and local burns of bearing parts will also cause fracture at the defect during impact overload or violent vibration, which is called defect fracture.
It should be pointed out that in the manufacturing process of bearings, the presence of the above defects can be correctly analyzed by instruments in the factory re inspection of raw materials, quality control of forging and heat treatment, and processing process control, and the control must be strengthened in the future.
But generally speaking, most of the fracture failures of deep groove ball bearings are overload failures.
1) Keep the bearings and their surroundings clean
2) Use carefully
If the bearing is impacted by carelessness during use, the bearing will suffer from scars, indentation, fracture and other injuries.
3) Use appropriate tools
4) Pay attention to the rust prevention of bearings
Avoid using in wet places, and wear gloves to prevent sweat.
5) Users should be familiar with bearings
6) Formulate operation specifications for the use of deep groove ball bearings
a. Storage of bearings
b. Cleaning of bearings and their surroundings
c. Inspection of dimension and processing quality of installation parts
d. Installation work
e. Inspection after installation
f. Disassembly operation
g. Maintenance (regular inspection)
h. Lubricant supplement